Added settings documentation. Very minor bug fix to step direction handling.

- Added v1.1 settings documentation to the markdown folder.

- Fixed a very minor bug in the step direction handling upon wakeup.
The direction mask would temporarily go back to default mask for about
a millisecond when moving in the same non-default direction. It did not
effect Grbl behavior before, but fixed for consistency.

doc/log/commit_log_v1.1.txt

@@ -1,3 +1,15 @@
+----------------
+Date: 2016-10-12
+Author: Sonny Jeon
+Subject: Spindle speed bug fix.
+
+- Spindle speed updating wasn’t working in the g-code parser due to
+some borked up logic on my part. Fixed it and should be operating as
+intended for both normal and laser spindle modes.
+
+- Elaborated a little more on the new sleep mode in the documentation.
+
+
 ----------------
 Date: 2016-10-11
 Author: Sonny Jeon